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Lactose tolerance is the ability to digest lactose, the sugar found in milk and dairy products.
Always consult a qualified dietitian when making significant changes to your diet.
Source: 1000 Genome Project. Global averages for both sexes
The ability to tolerate lactose is strongly influenced by the body's production of the enzyme lactase, which is encoded by the LCT gene.
To a lesser extent, your gut microbiome influences whether or not you can digest lactose.